Question: vector num; num.push_back(1); num.push_back(2); num.push_back(3); num.push_back(4); Select 2 expressions equivalent to 4 in this code: a. num.last() b. num[3] c. num.at(4) d. num.back()

vectornum;

num.push_back(1);

num.push_back(2);

num.push_back(3);

num.push_back(4);

Select 2 expressions equivalent to 4 in this code:

a.

num.last()
b.

num[3]
c.

num.at(4)
d.

num.back()

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